Among those 22,191 who made reports, about 7,000 — nearly 32% — reported any health impacts. More than 6,200 — about 28% — reported they were unable to perform normal daily activities, mostly commonly on the day after vaccination.
The most common complaints were injection site pain (71%), fatigue (56%) and a headache (43.4%). Of those who reported general pain, only about 7% described it as “severe.” Severe was defined as pain that makes “daily activities difficult or impossible.”
Of the 12,591 people who tracked how they felt after each dose of an mRNA vaccine, 79.4% reported a local reaction to the third shot and 74.1% reported a systemic reaction. That’s similar to what people reported after a second dose, when 77.6% reported local reactions and 76.5% reported systemic reactions.
No unexpected patterns of adverse reactions were identified, the report said.
“The third Covid-19 shots appear to be safe and people experienced similar mild to moderate reactions, if any to the Covid-19 vaccine,” according to the report.
Some people reported getting a booster from different company than their original vaccine or getting a second dose of the single-dose Johnson & Johnson vaccine, but the report’s authors said the numbers in both cases were too small to draw any conclusions.